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Table 3 Mean (SD) of the RMS values (%MVC) of right and left masseter and temporal muscles in individuals without TMD (WG), with mild TMD (MG) and with moderate to severe TMD (MSG)

From: Influence of temporomandibular disorder on temporal and masseter muscles and occlusal contacts in adolescents: an electromyographic study

  WG MG MSG p- value
Resting position     
Right temporal 2.93 ± 1.53 2.55 ± 1.49 20.61 ± 10.87 <0.001*
Right masseter 2.14 ± 0.81 1.71 ± 0.59 23.85 ± 14.25 <0.001*
Left temporal 3.18 ± 2.17 2.47 ± 1.21 29.11 ± 18.78 <0.001*
Left masseter 2.08 ± 0.63 2.35 ± 1.59 21.89 ± 12.97 <0.001*
Maximum voluntary clenching     
Right temporal 74.17 ± 8.60 72.20 ± 20.12 68.95 ± 8.37 0.10
Right masseter 67.59 ± 27.41 66.32 ± 66.83 66.83 ± 11.12 0.77
Left temporal 70.49 ± 11.61 75.81 ± 11.50 67.18 ± 12.75 0.21
Left masseter 74.07 ± 12.86 68.40 ± 11.02 64.99 ± 7.94 0.44
Chewing     
Right temporal 36.83 ± 13.95 42.31 ± 17.29 45.48 ± 13.03 0.32
Right masseter 38.02 ± 15.13 44.44 ± 17.34 46.11 ± 14.15 0.40
Left temporal 38.02 ± 15.13 44.44 ± 17.34 46.11 ± 14.15 0.51
Left masseter 35.03 ± 12.11 44.76 ± 15.94 46.62 ± 18.82 0.15
  1. *Significant difference (p < 0.05; Kruskal-Wallis test).